Python: Fix onnx pkg by pinning. Pin openai < 2.0.

[moonbox3]

Motivation and Context

For the latest onnxruntime 1.23.2 pkg: our GitHub Actions run is failing because uv is not matching the macOS wheel tag.
Pinning to last-known-good until it's sorted out.

• Pin openai pkg < 2.0 until we can investigate if 2.0 brings in other breaking changes.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[markwallace-microsoft]

Python Test Coverage Report •

File	Stmts	Miss	Cover	Missing
agents/open_ai
assistant_thread_actions.py	339	57	83%	108, 111, 117, 196, 198, 237–243, 417, 475, 488, 501, 600–601, 603–604, 610–611, 613–614, 616–619, 621–622, 624–625, 627–628, 642–646, 649–651, 698, 700–701, 705–709, 711–712, 726–727, 798, 803, 835
openai_assistant_agent.py	364	71	80%	76, 112–115, 120, 124–125, 158, 175–176, 184–189, 196–197, 200, 205–206, 217–223, 401–402, 409–410, 412–413, 415–416, 418–423, 425, 473–474, 477, 480, 483–492, 494, 504, 528–529, 567, 583, 593, 609, 622, 658, 802, 911, 1018
openai_responses_agent.py	417	104	75%	67, 96, 115–118, 126, 130–131, 163–167, 171, 176, 181, 186, 192, 197–198, 201, 204, 209–214, 219–220, 222–223, 229–232, 238, 240–241, 245–249, 350, 354, 358, 360, 366, 379, 381, 383, 387, 484–485, 492–493, 495–496, 498–499, 501–506, 508, 556–557, 560, 605, 621, 631, 665, 673, 676, 680, 682, 685, 708, 711–715, 725, 765, 790, 801, 890, 1013, 1057, 1059, 1133, 1177–1178, 1180–1184, 1203
connectors/ai/open_ai/services
open_ai_handler.py	120	19	84%	150–151, 156–159, 164, 172–173, 189–190, 202, 211–212, 225–229
open_ai_text_to_image_base.py	101	15	85%	47, 51, 55, 63, 112, 114, 119, 128, 136–137, 139, 142, 206, 240, 244
TOTAL	27295	4560	83%

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
3759	23 💤	0 ❌	0 🔥	1m 43s ⏱️